JP6740837B2 - Sealant film with resealability and dead hold - Google Patents

Description

The present invention relates to a sealant film, a laminate, a lid material, a container, a packaging material and a packaging bag having resealing and dead-holding properties. More specifically, a container provided with a lid material and a bottom material, or a packaging bag using the packaging material can be opened once and then resealed by pressing the heat-sealed portion, and as-is. The present invention relates to a sealant film, a laminate, a lid material, a container, a packaging material and a packaging bag that can maintain the shape of

BACKGROUND ART Some foods such as ham and potato chips, and containers and packaging bags used for various pharmaceutical products can be opened once and then resealed (hereinafter, also referred to as “reseal”). For example, a laminated film having an adhesive resin layer is used as a lid material for a container or a packaging material for a packaging bag, and the lid material and the bottom material can be resealed due to the adhesiveness of the adhesive resin layer, or the packaging materials can be resealed. There are possible packaging bags.
Regarding a package with a resealing function having such an adhesive resin layer, a surface resin layer, an adhesive resin layer, a release resin layer, and a heat seal resin layer are laminated in this order, and the tackifying resin is styrene-based There is a lid material containing a plastic elastomer and a tackifier and a package using the lid material (Patent Document 1).

Further, regarding a container or a packaging bag, when it is folded back and opened, it can retain the shape as it is opened and does not return to its original state when left still (hereinafter, also referred to as “dead hold property”). Some have.
Regarding the laminated body having such a dead hold property, there is a lid member having a paper layer and a tab at the periphery of a laminated structure in which a sealant layer is provided on the back surface of the paper layer (Patent Document 2).

Japanese Patent No. 5106795 JP, 2001-10657, A

However, the lid material and the package described in Patent Document 1 have low unsealing strength after resealing, and particularly low unsealing strength after repeating unsealing and resealing. Further, the lid material and the package described in Patent Document 1 require a release resin layer, and the release resin layer may not provide sufficient workability during the production of the lid material or the packaging bag. Further, in the cover material described in Patent Document 2, the paper layer that contributes to the dead hold property is a different material from the sealant layer, and the paper layer and the sealant layer could not be manufactured by coextrusion.

The present invention advantageously solves the above problems, high opening strength after resealing, high opening strength even after repeated opening and resealing, no problem in practical workability, resealability Another object of the present invention is to provide a sealant film, a laminate, a lid material, a container, a packaging material and a packaging bag having a dead hold property.

As a result of earnestly researching the sealant film having an adhesive resin layer, a laminate, a lid, a container, a packaging material and a packaging bag, the inventors have at least an adhesive resin layer and a heat-sealing layer having a dead hold property, Laminate to form a sealant film, the adhesive resin layer is an adhesive resin layer containing a styrene monomer, a styrene block copolymer and a tackifier, and the heat seal layer is a resin layer containing a cyclic polyolefin. As a result, it was found that a container or a packaging bag using the sealant film has a dead hold property and a high unsealing strength after resealing, and has high unsealing strength even after repeated unsealing.

The present invention is based on the above findings.
That is, the sealant film having the resealing property and the dead hold property of the present invention is a sealant film having at least an adhesive resin layer and a heat seal layer, which are laminated,
The adhesive resin layer is a resin layer containing a styrene monomer, a styrene block copolymer and a tackifier,
The heat seal layer is a resin layer containing a cyclic polyolefin.

Further, the laminate of the present invention is characterized in that a base material layer is superposed on the adhesive resin layer side of the sealant film having the above-mentioned resealing property and dead hold property via an adhesive layer. .. Further, the lid member body of the present invention is characterized by comprising the above-mentioned laminated body. Further, the container of the present invention includes the above-mentioned lid material and a bottom material that is heat-sealed with the lid material, and the surface layer of the bottom material has a heat-sealing layer of the same kind as the heat-sealing layer of the lid material. It is characterized by The packaging material of the present invention is characterized by comprising the above-mentioned laminated body. The packaging bag of the present invention is characterized by being made of the packaging material described above.

According to the present invention, the opening strength after resealing is high, the opening strength is high even after repeated opening and resealing, and the sealant film, the laminate, the lid material, the container, and the packaging material have the resealing property and the dead hold property. And a packaging bag is obtained.

It is a typical sectional view of one embodiment of the sealant film which has resealing nature and dead hold nature of the present invention. It is a typical sectional view of one embodiment of the layered product of the present invention. It is a typical sectional view of one embodiment of the container of the present invention. It is a typical sectional view when opening one embodiment of the container of the present invention. It is a typical sectional view of one embodiment of the packaging bag of the present invention. It is a typical sectional view at the time of opening of one embodiment of a packaging bag of the present invention. It is a typical sectional view of another embodiment of the packaging bag of the present invention. It is a typical sectional view at the time of opening of another embodiment of a packaging bag of the present invention.

Hereinafter, embodiments of a sealant film (hereinafter, also simply referred to as “sealant film”) having re-sealing property and dead hold property, a laminate, a lid material, a container and a packaging bag of the present invention will be described with reference to the drawings. Explained.

[Sealant film]
FIG. 1 shows a schematic cross-sectional view of one embodiment of the sealant film of the present invention. In FIG. 1, the sealant film 1 is made of a multilayer film, and has an adhesive resin layer 2 and a heat seal layer 3 laminated in this order.
The adhesive resin layer 2 of the sealant film 1 is a resin layer containing a styrene monomer, a styrene block copolymer, and a tackifier.
The heat seal layer 3 is a resin layer containing cyclic polyolefin.

Since the sealant film 1 does not have a release resin layer, the sealant film 1 does not cause deterioration in processability during the production of a laminate using the release resin layer or during production of a container or a packaging bag, and is a practically sufficient process. Have sex. Further, the sealant film 1 has the adhesive resin layer 2 made of a resin containing a styrene monomer, a styrene block copolymer, and a tackifier, so that the unsealing strength after resealing is high and the unsealing and resealing are repeated. A sealant film having a high opening strength can be obtained.

Further, since the heat seal layer 3 is the resin layer containing the cyclic polyolefin, the sealant film 1 has a good dead hold property due to the cyclic polyolefin. Further, the sealant film 1 can maintain the opened shape when the container or the packaging bag is opened due to the combination of the dead hold property and the above-mentioned resealing property, so that the contents of the container or the packaging bag can be easily formed. Since the unsealed portion of the packaging bag of the container can be resealed after that, the storability of the content is excellent. Therefore, the sealant 1 makes it possible to obtain a lid material and a packaging material suitable for use in foods, pharmaceuticals and the like.

In addition, since the sealant film 1 has a two-layer structure of the adhesive support layer and the heat seal layer as a minimum structure, the thickness of the laminate using the sealant film 1 can be relatively thin, and the weight can be reduced. can do. Therefore, the sealant film 1 is suitable as a part of the packaging material used for the packaging bag.

The thickness of the sealant film 1 can be appropriately adjusted to a thickness required for a lid material or a packaging material in which the sealant film 1 is used as a part of the laminate, and can be about 10 to 100 μm.

(Adhesive resin layer)
The adhesive resin layer 2 preferably contains 10 to 35% by mass of the styrene monomer, 30 to 60% by mass of the styrene block copolymer, and 5 to 60% by mass of the tackifier. By containing the styrene monomer, the styrene block copolymer and the tackifier in the above numerical range, particularly high unsealing strength can be obtained. More preferably, the styrene monomer content is 15 to 30 mass %, the styrene block copolymer content is 35 to 60 mass %, and the tackifier content is 5 to 25 mass %.
The adhesive resin layer 2 may contain an additive other than the styrene monomer, the styrene block copolymer, the tackifier, and the like. For example, an inorganic filler can be included. By including the inorganic filler, blocking can be suppressed. As the inorganic filler, one or more selected from talc, mica, calcium silicate, glass fiber, calcium carbonate, magnesium carbonate, carbon fiber, barium sulfate, calcium sulfate and the like can be used. The blending amount of the inorganic filler with respect to the adhesive resin can be 0.1 to 2.5% by mass.

The styrene block copolymer of the adhesive resin layer 2 is a block copolymer of styrene and another comonomer, and the other comonomer is preferably one selected from isoprene, butadiene and butylene. When it is isoprene, the styrene block copolymer is a styrene-isoprene-styrene type block copolymer in which styrene is polymerized at both ends of a chain-like isoprene. Similarly, in the case of butadiene, it is a styrene-butadiene-styrene type block copolymer, and in the case of butylene, it is a styrene-butylene-styrene type block copolymer.

The tackifier for the adhesive resin layer 2 may be, for example, one or more selected from rosin, hydrogenated rosin, rosin derivative, hydrogenated rosin derivative, rosin ester, polyterpene, phenol terpene and phenol terpene derivative. preferable.

The tackifier of the adhesive resin layer 2 preferably has a softening point of 5 to 150°C. When the softening point is 5 to 150°C, the adhesiveness of the adhesive resin layer 2 can be appropriately adjusted.

The adhesive resin containing the above-mentioned styrene monomer, styrene block copolymer and tackifier preferably has a melt flow rate MFR (230° C., 2.16 kg) of 2 to 100 g/10 min. More preferably, it is 2 to 50 g/10 min.
The pressure-sensitive adhesive resin containing the above-mentioned styrene monomer, styrene block copolymer and tackifier preferably has a density of 0.90 to 0.97 g/cm ³ .

The adhesive resin preferably used for the adhesive resin layer includes, for example, the product name MWW65 of Bostik SA having the above component composition.

The thickness of the adhesive resin layer 2 is preferably about 5 to 50 μm. When the thickness is about 5 to 50 μm, the adhesive function can be sufficiently exerted.

(Heat seal layer)
The heat-sealing layer 3 is a container or a packaging bag in which a laminate (which will be described later in detail) including a sealant film is used as a lid material or a packaging material, and is sealed with the bottom material of the container or between packaging materials of the packaging bag. And a layer for imparting dead hold to the sealant film 1. The heat seal layer 3 is a layer containing a resin that can be melted by heat and mutually fused, and is also a mixed resin (blend) layer that is a hard resin and contains a cyclic polyolefin excellent in shape retention.

As the resin contained in the heat seal layer 3 and capable of being melted by heat and mutually fused, an olefin resin is preferable, and examples thereof include low density polyethylene, medium density polyethylene, high density polyethylene, and linear (linear) low density. Polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-(meth)acrylic acid ethyl copolymer, ethylene-(meth)acrylic acid copolymer, ethylene-propylene copolymer, methylpentene polymer, polyethylene Or a polyolefin resin obtained by modifying a polyolefin resin such as polypropylene with an unsaturated carboxylic acid such as acrylic acid, methacrylic acid, maleic anhydride, fumaric acid, etc., and ternary of ethylene-(meth)acrylic acid ester-unsaturated carboxylic acid A resin made of one or more of a copolymer resin, a cyclic polyolefin resin, a cyclic olefin copolymer, polyethylene terephthalate (PET), polyacrylonitrile (PAN), and the like can be used.

The sealant film 1 of the present invention is used as a cover material of a container or a packaging material of a packaging bag as a laminate 11 described later. Therefore, it is preferable that the heat-sealing layer 3 be made of a resin suitable for the application, such as the same resin as the surface layer (sealing layer) of the bottom material of the container. From this viewpoint, the heat seal layer 3 is preferably polyethylene or polypropylene among the olefin resins listed above. Specific examples of polyethylene include low density polyethylene, linear low density polyethylene, medium density polyethylene, and high density polyethylene. More preferred are low density polyethylene and linear low density polyethylene.

Further, as the polypropylene, any of homopolypropylene composed of homopolymer, random polypropylene composed of random copolymer, and block polypropylene composed of block copolymer can be used.

When the resin of the heat seal layer is polyethylene, it is preferable to use one having a melting point of 80 to 120°C.

The cyclic polyolefin contained in the heat-sealing layer 3 is a ring-opening metathesis polymer (COP) obtained by polymerizing a cyclic olefin by a metathesis ring-opening polymerization reaction, and a copolymer of a cyclic olefin and an α-olefin (chain olefin). Includes coalesced or cyclic olefin copolymers (COC).

As the cyclic olefin, any cyclic hydrocarbon having an ethylenic unsaturated bond and a bicyclo ring can be used, and particularly, one having a bicyclo[2.2.1]hept-2-ene (norbornene) skeleton is used. preferable.
Specifically, bicyclo [2.2.1] hept-2-ene and derivatives thereof, tricyclo [4.3.0.1 ^{2.5]-3-decene} and derivatives thereof, tricyclo [4.4.0.1 ^2.5] -3-undecene and derivatives thereof, tetracyclo [4.4.0.1 ^2.5 .1 ^7.10] -3-dodecene and derivatives thereof, pentacyclo ^{[6.5.1.1 3.6 .0 2.7 .0 9.13]} - 4 pentadecene and its derivatives, pentacyclo ^{[7.4.0.1 2.5 .1 9.12 .0 8.13]} -3- pentadecene and its derivatives, pentacyclo ^{[6.5.1.1 3.6 .0 2.7 .0 9.13]} - 4,10 penta decadiene and its derivatives, pentacyclo ^{[8.4.0.1 2.5 .1 9.12 .0 8.13]} -3- hexadecene and it derivatives, and the like, without limitation. The cyclic olefin may have a polar group such as an ester group, a carboxyl group, and a carboxylic acid anhydride group as a substituent.

As the α-olefin copolymerized with the cyclic olefin, ethylene and α-olefin having 3 to 20 carbon atoms can be used, and specifically, ethylene, propylene, 1-butene, 1-pentene, 3-methyl. -1-Butene, 1-hexene, 4-methyl-1-pentene and the like can be mentioned, and ethylene is preferable.

In the present invention, the production of the ring-opening metathesis polymer is not particularly limited as long as it is a known ring-opening metathesis polymerization reaction, and can be produced by subjecting the above cyclic olefin to ring-opening polymerization using a polymerization catalyst. ..
Moreover, in the production of the cyclic olefin copolymer, 25 to 45 mol% of α-olefin and 55 to 75 mol% of the cyclic olefin are randomly polymerized by using a single-site catalyst or a multi-site catalyst such as a metallocene catalyst. Done by.

Several ring-opening metathesis polymers and cyclic olefin copolymers preferably used in the present invention are commercially available, for example, "ZEONOR (registered trademark)" manufactured by Nippon Zeon Co., Ltd. or "TOPAS manufactured by Polyplastics Co., Ltd." (Registered trademark)” and the like.

The compounding ratio of the cyclic polyolefin in the resin forming the heat seal layer 3 is preferably 10 to 50% by mass, and more preferably 10 to 40% by mass. When the blending ratio of the cyclic polyolefin is 10% by mass or more, sufficient dead hold property can be obtained. When the compounding ratio of the monocyclic polyolefin is 50% by mass or less, good film-forming property can be obtained, and good durability and heat-sealing property of the film-formed resin layer can be obtained.

The thickness of the heat seal layer 3 is not particularly limited, but is preferably about 5 to 50 μm. It is preferably 40 μm or less, more preferably 30 μm or less.

(Method for manufacturing sealant film)
The sealant film 1 is formed, for example, by extrusion laminating the adhesive resin layer 2 and the heat seal layer 3 on the surface of an anchor coating agent layer formed on one surface of a base material of a laminate described later by melt coextrusion (hereinafter, “ Also referred to as a "coextrusion laminate"). By manufacturing by extrusion laminating by melt co-extrusion, it is not necessary to separately laminate the adhesive resin layer 2 and the heat seal layer 3 into a film and then laminate them.

In the production of the sealant film, the surface of the adhesive resin of the adhesive resin layer 2 is preferably coated with an inorganic filler. Since the surface of the adhesive resin is coated with the inorganic filler, blocking can be suppressed. As the inorganic filler, one or more selected from talc, mica, calcium silicate, glass fiber, calcium carbonate, magnesium carbonate, carbon fiber, barium sulfate, calcium sulfate and the like can be used. The blending amount of the inorganic filler with respect to the adhesive resin can be 0.5 to 2.5 mass %.

[Laminate]
One embodiment of the laminated body of the present invention will be described with reference to FIG. FIG. 2 is a schematic cross-sectional view of one embodiment of the laminated body of the present invention. In the illustrated laminated body 11, the base material layer 4 is superposed on the adhesive resin layer 2 side of the sealant film 1 having the adhesive resin layer 2 and the heat seal layer 3 described above with the adhesive layer 5 interposed therebetween. The laminated body 11 can be used as a lid material for a container or a packaging material for a packaging bag.

(Base material layer)
As the base material layer 4, a resin used as a base material for the lid material and the packaging material can be appropriately used. Specifically, low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, polypropylene, polyvinyl alcohol, polyacrylonitrile, polycarbonate, ethylene-vinyl acetate copolymer, ionomer, ethylene-(meth)acrylic acid. Copolymer, ethylene-(meth)ethyl acrylate copolymer, ethylene-propylene copolymer, methylpentene, polybutene, acid-modified polyolefin resin, polyamide resin, polystyrene resin, low crystalline saturated polyester or non- Crystalline polyester resin, polyvinyl chloride (PVC), polyvinylidene chloride (PVDC), polyvinylidene fluoride (PVDF), tetrafluoroethylene-ethylene copolymer (ETFE), polytetrafluoroethylene (PTFE), MXD6, A film made of cellophane, moisture-proof cellophane or the like can be used.

Among the resin films listed above, polyester resins such as polyethylene terephthalate (hereinafter also referred to as “PET”), polyethylene naphthalate (PEN), polybutylene terephthalate (PBT), polybutylene naphthalate (PBN); polycapron Polyamide resins such as amide (nylon 6), polyhexamethylene adipamide (nylon 66), poly-p-xylylene adipamide (MXD6 nylon); polyolefin resins such as polyethylene and polypropylene are preferable. In particular, the PET film is more preferable for the base material layer 4 because it has high transparency and is excellent in dimensional stability and heat resistance. The above-mentioned polyester resin, polyamide resin and polyolefin resin may be a mixture thereof.

The base material layer 4 may be a multilayer film in which two or more resin films are laminated. In the case of a multilayer film, the layers may have the same composition or different compositions.

These resin films may be unstretched films, but from the viewpoint of transparency and the like, uniaxially stretched films or biaxially stretched films are preferably used. The thickness of the film is not particularly limited, but is about 5 to 500 μm, preferably 5 to 300 μm, more preferably 10 to 100 μm.

The base material layer 4 may have a laminated structure in which a barrier layer is further laminated on the above resin film layer. By stacking the barrier layers, it is possible to effectively suppress the weight reduction of the contents and the deterioration of the contents.

The barrier layer is, for example, a metal foil made of aluminum foil or the like, a vapor deposition film of an inorganic material or an inorganic oxide, a vapor deposition film having the vapor deposition film on a resin film, or an ethylene-vinyl alcohol copolymer, polyvinylidene chloride, polyvinyl. It may be a layer made of alcohol, a gas barrier resin such as MXD6, or a combination thereof.

From the viewpoint of ensuring the visibility of foods, the barrier layer is preferably transparent, and an inorganic oxide vapor deposition film, or an inorganic oxide vapor deposition film obtained by providing the vapor deposition film on a plastic film is particularly preferable. used. The inorganic oxide forming the vapor-deposited film may be an inorganic oxide that is transparent and has a gas barrier property against oxygen, water vapor, etc., and examples thereof include aluminum oxide, silicon oxide, magnesium oxide, calcium oxide, and oxide. Among oxides such as zirconium, titanium oxide, boron oxide, hafnium oxide and barium oxide, aluminum oxide and silicon oxide are preferably used from the viewpoints of gas barrier property, production efficiency and the like.

The surface of the base material layer 4 may be subjected to surface treatment for improving wettability such as corona treatment, ozone treatment and flame treatment in order to improve adhesiveness. Such surface treatment is performed on the surface of the base material layer 4 on which the adhesive layer 5 is formed.

(Adhesive layer)
The adhesive layer 5 is a layer for adhering the base material layer 4 and the sealant film 1. The adhesive layer 5 is not limited to the adhesive used for dry lamination, but includes an anchor coating agent used for extrusion lamination and a resin that can be adhered to the adhesive resin layer 2 of the sealant film 1. The coating amount of the anchor coating agent used for extrusion lamination has an advantage that it is smaller than the coating amount of the adhesive agent used for dry lamination. For the adhesive layer 6, for example, a urethane adhesive or a urethane anchor coating agent can be used. The resin layer capable of adhering to the adhesive resin layer 2 of the sealant film 1 has an interlayer strength with the adhesive resin layer 2 that is equal to or more than the interlayer strength between the adhesive resin layer 2 and the heat seal layer 3 in the sealant film 1. It is preferably a material.
In extrusion lamination, a resin capable of adhering to the adhesive resin layer can be melt extruded between the sealant film 1 and the base film coated with the anchor coating agent. For example, polyethylene can be melt extruded between the base film and the sealant film. Thus, the laminated body 11 can include a resin layer between the adhesive resin layer 2 of the sealant film 1 and the adhesive layer 6.

(Method for manufacturing laminated body)
The laminate 11 can be produced, for example, by laminating each layer of the sealant film 1 described above on the surface of the base film having the anchor coating agent layer formed thereon by coextrusion lamination. When the laminate has a barrier layer, it is produced by extrusion laminating, in which a resin capable of adhering to both films is melt-extruded between the film containing the base material layer and the anchor coating agent layer and the barrier layer film. You can

[Lid]
One embodiment of the lid material of the present invention will be described with reference to FIG. FIG. 3 is a schematic cross-sectional view of the container 21 having a lid material and a bottom material. The laminated body 11 described above can be used as the lid member 22 of the container 21 configured by the lid member 22 and the bottom member 23. The lid member 22 is heat-sealed with the heat seal layer 24 on the surface layer of the bottom member 23 to seal the container. It is preferable that the heat seal layer 3 of the laminated body 11 used for the lid member 22 and the heat seal layer 24 of the surface layer of the bottom member 23 are made of the same kind of resin because the opening strength can be increased. For example, the lid member 22 in which the heat seal layer 3 of the laminated body 11 is polyethylene is used in a container in which the heat seal layer 24 on the surface layer of the bottom member 23 is polyethylene. Further, the lid member 22 in which the heat seal layer 3 of the laminated body 11 is polypropylene is used in a container in which the heat seal layer 24 on the surface layer of the bottom member 23 is polypropylene.

[container]
One embodiment of the container of the present invention will be described with reference to FIG. 3 described above. The container 21 of the present invention includes the above-described lid member 22 of the present invention and a bottom member 23 that is heat-sealed with the lid member 22. The surface layer of the bottom material 23 preferably has a heat seal layer 24 of the same type as the heat seal layer 3 of the lid material 22 described above.

Regarding the container 21 in which the lid member 22 and the bottom member 23 are heat-sealed as described above, when the lid member 22 is opened, the lid member 22 is provided between the adhesive resin layer 2 and the heat seal layer 3 as shown in FIG. To separate. Therefore, the adhesive resin layer 2 of the lid member 22 after opening is exposed as a surface layer. The pressure-sensitive adhesive resin layer 2 adheres to the bottom material 23 by pressure-bonding the lid material 22 after opening by hand. Therefore, the lid member 22 and the container 21 have a resealing property.

The container 21 has excellent opening strength when the container 21 is first opened, the lid member 22 is pressure-bonded by hand, and then the lid member 22 is opened again (hereinafter, referred to as “first reopening”). The opening strength of the first reopening is 2.0 to 7.0 N/15 mm.

Further, the container 21 has excellent opening strength when the lid member 22 is pressure-bonded by hand after the first reopening and then the lid member 22 is reopened (hereinafter, referred to as “second reopening”). The opening strength of the second reopening is 0.9 to 6.0 N/15 mm.

Further, the container 21 of the present invention is opened when the lid member 22 is pressure-bonded by hand after the second reopening and then the lid member 22 is reopened (hereinafter, referred to as “third reopening”). The strength is excellent, and the opening strength of the third reopening is 0.7 to 4.5 N/15 mm.
The container 21 has a high opening strength after the third reopening, and has a high opening strength even after repeated opening-resealing.

[Packaging material]
One embodiment of the packaging material of the present invention will be described with reference to FIG. The laminated body 11 described above can be used as it is for the packaging material 31. A packaging bag such as a pillow bag can be obtained by using the packaging material 31 to form a bag with the heat-sealing layer on the inner surface and heat-sealing the heat-sealing layers that have been stacked. Further, by using the packaging material 31 and another packaging material, the heat-sealing layer of the packaging material 31 and the heat-sealing layer of another packaging material are pasted together to obtain a packaging bag such as a four-sided bag. it can.

[Packing bag]
One embodiment of the packaging bag of the present invention will be described with reference to FIG. FIG. 5 is a schematic sectional view of the packaging bag 41. The packaging bag 41 is obtained by heat-sealing the heat-sealing layers 3 of the packaging material 31 using the laminated body 11 described above. It is preferable that the heat-sealing layers 3 are heat-sealed with each other to seal the packaging bag because the unsealing strength can be increased by heat-sealing the same kind of resin.

When the packaging bag 41 in which the heat-sealing layers 3 are heat-sealed is opened, the adhesive resin layer 2 and the heat-sealing layer 3 of the packaging material 31 are separated as shown in FIG. Therefore, after opening, the adhesive resin layer 2 is exposed as a surface layer. The adhesive resin layer 2 adheres to the separated packaging material 31 by pressing the packaging material 31 by hand after opening. Therefore, the packaging material 31 and the packaging bag 41 of the present invention have a resealing property.

The packaging bag 41 has excellent opening strength when the packaging bag 41 is first opened, and the opening strength at this time is 2.0 to 30.0 N/15 mm. In addition, the packaging bag 41 has excellent opening strength when the packaging bag 41 is first opened, then pressure-bonded by hand, and then the packaging bag 41 is reopened (hereinafter, referred to as "first reopening"). The opening strength of the first reopening is 1.0 to 8.0 N/15 mm.

In addition, the packaging bag 41 has the opening strength when the packaging bag 41 is manually pressure-bonded after the first reopening and then the packaging bag 41 is reopened (hereinafter, referred to as “second reopening”). The opening strength of the second reopening is 1.0 to 7.5 N/15 mm.

In addition, the packaging bag has excellent opening strength when the packaging bag 41 is pressure-bonded by hand after the second reopening and then the packaging bag 41 is reopened (hereinafter referred to as “third reopening”). The opening strength of the third reopening is 1.0 to 6.0 N/15 mm.

In addition, the packaging bag has excellent opening strength when the packaging bag 41 is pressure-bonded by hand after the third reopening and then the packaging bag 41 is reopened (hereinafter referred to as “fourth reopening”). The opening strength of the fourth reopening is 1.0 to 4.5 N/15 mm.

The packaging bag 41 has high opening strength at the fourth reopening, and has high opening strength even after repeated opening-resealing.

FIG. 7 shows another embodiment of the packaging bag of the present invention. In the packaging bag 42 of FIG. 7, a packaging material 31 using the above-described laminated body 11 and a packaging material 32 that does not have the adhesive resin layer 2 in the above-described laminated body 11 are prepared, and the heat-sealing layer of the packaging material 31 is prepared. 3 and the heat-sealing layer 3 of the packaging material 32 are heat-sealed. Since the packaging bag 42 is separated between the heat-sealing layer 3 of the packaging material 31 and the adjacent adhesive resin layer 2 at the time of opening as shown in FIG. 8, the packaging material 32 to be heat-sealed with the packaging material 31 is adhesive. The resin layer 2 may be omitted.

Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.

[Example 1]
A 12 μm-thick biaxially stretched PET film (E-5100 manufactured by Toyobo Co., Ltd.) having one surface corona-treated as a base material layer was set as the primary paper feed of an extrusion laminating machine. The corona-treated surface of this substrate layer was coated with a two-component urethane anchor coating agent (Takelac A3210/Takenate A3075 manufactured by Mitsui Chemicals, Inc.) to a thickness of 0.3 g/m ² (dry state), A heat treatment was performed at 100° C. for 2 seconds to form an anchor coating agent layer.

Next, on the surface of the anchor coating agent layer, from a T-die, a styrene block polymer having a thickness of 15 μm as an adhesive resin layer (MWW65 manufactured by Bostik SA, density 0.96 g/cm ³ , styrene monomer 12% mass, styrene block copolymer) was used. Cyclic polyolefin (TOPAS 8007F-600 manufactured by Polyplastics Co., Ltd.) having a polymer content of 60% by mass, a tackifier of 22.5% by mass, and a balance of 1.2% by mass of an inorganic filler) and a heat seal layer having a thickness of 10 μm. ) And linear low density polyethylene (LLDPE, melting point 96° C., density 0.927 g/cm ² ) mixed resin (mixed resin is a blend of cyclic polyolefin of 20% by mass and LLDPE of 80% by mass). Lamination was performed to obtain a laminated body in which the PET layer/anchor coating agent layer/adhesive resin layer/heat seal layer were laminated in this order. In the laminate, the PET layer had a thickness of 12 μm, the adhesive resin layer had a thickness of 15 μm, and the heat seal layer had a thickness of 10 μm.

The obtained laminate is folded so that the heat-sealing layers face each other, the heat-sealing layers are overlapped with each other, and heat-sealed under the conditions of a heating temperature of 140° C., a pressure of 1 kgf/cm ² , and a sealing time of 1 second, and a packaging bag. Got

[Example 2]
Example 2 is an example of a packaging bag in which a first laminate having an adhesive resin layer and a second laminate having no adhesive resin layer are heat-sealed as shown in FIG. 7.
(First laminated body)
The first laminate has the same layer configuration, thickness, and manufacturing method as those of the first embodiment.
(Second laminated body)
A 12 μm-thick biaxially stretched PET film (E-5100 manufactured by Toyobo Co., Ltd.) having one surface corona-treated as a base material layer was set as the primary paper feed of an extrusion laminating machine. The corona-treated surface of this substrate layer was coated with a two-component urethane anchor coating agent (Takelac A3210/Takenate A3075 manufactured by Mitsui Chemicals, Inc.) to a thickness of 0.3 g/m ² (dry state), A heat treatment was performed at 100° C. for 2 seconds to form an anchor coating agent layer.

Next, on the surface of the anchor coat agent layer, a 25 μm-thick low-density polyethylene (LDPE; Novatec LC600A manufactured by Nippon Polyethylene Corporation) was melt-extruded as a heat-sealing layer from a T-die at a set temperature of 290° C. to form a PET layer. A second laminated body was obtained by laminating the following: /anchor coat agent layer/heat seal layer. In the second laminate, the PET layer had a thickness of 12 μm and the heat seal layer had a thickness of 25 μm.

(Packaging bag)
The heat-sealing layer of the first laminated body and the heat-sealing layer of the second laminated body are superposed and heat-sealed under the conditions of a heating temperature of 140° C., a pressure of 1 kgf/cm ² and a sealing time of 1 second, and packaging. I got a bag.

[Example 3]
A laminate and a packaging bag were obtained in the same manner as in Example 1 except that the thickness of the adhesive resin layer of the laminate and the packaging bag of Example 1 was changed to 25 μm and the thickness of the heat seal layer was changed to 15 μm.

[Example 4]
Example 4, as shown in FIG. 7, is an example of a packaging bag in which a first laminate having an adhesive resin layer and a second laminate not having an adhesive resin layer are heat-sealed. In comparison with the laminate and the packaging bag of Example 2, in the laminate and the packaging bag of Example 4, the thickness of the adhesive resin layer of the first laminate was changed to 25 μm and the thickness of the heat seal layer was changed to 15 μm. Other than that is the same as that of Example 2.
(First laminated body)
The first laminate has the same layer configuration, thickness, and manufacturing method as the laminate of the third embodiment.
(Second laminated body)
The second laminate has the same layer configuration, thickness, and manufacturing method as those of the second laminate of Example 2.
The heat-sealing layer of the first laminated body and the heat-sealing layer of the second laminated body are overlaid, and heat-sealed under the conditions of a heating temperature of 140° C., a pressure of 1 kgf/cm ² , and a sealing time of 1 second to form a packaging bag. Obtained.

[Example 5]
Example 5 is an example in which the laminate has a barrier layer.
A 12 μm-thick biaxially stretched PET film (E-5100 manufactured by Toyobo Co., Ltd.) having one surface corona-treated as a base material layer was set as the primary paper feed of an extrusion laminating machine. The corona-treated surface of this substrate layer was coated with a two-component urethane anchor coating agent (Takelac A3210/Takenate A3075 manufactured by Mitsui Chemicals, Inc.) to a thickness of 0.3 g/m ² (dry state), A heat treatment was performed at 100° C. for 2 seconds to form an anchor coating agent layer.

Next, an aluminum foil (1N30 manufactured by Toyo Aluminum Co., Ltd.) having a thickness of 7 μm was set as a barrier layer in the secondary sheet feeding of the extrusion laminating machine, and was placed between the anchor coating agent layer of the laminated film and the aluminum foil. , T-die, low density polyethylene (LDPE; Novatec LC600A manufactured by Nippon Polyethylene Co., Ltd.) is melt-extruded at 330° C. to a thickness of 15 μm as an adhesive layer, and the anchor coat agent layer and the aluminum foil are adhesively bonded. Sand laminated through layers of polyethylene. Then, on the surface of the aluminum barrier layer of the laminated film obtained by the above-mentioned sand lamination, a two-pack type urethane anchor coating agent (Takelac A3210/Takenate A3075 manufactured by Mitsui Chemicals, Inc.) was formed to a thickness of 0.3 g/m ² (dry). State) and heat treated at 90° C. for 2 seconds to form an anchor coating agent layer.

Further, on the surface of the anchor coating agent layer, from a T-die, a styrene block polymer (MWW65 manufactured by Bostik SA, density 0.96 g/cm ³ ) having a thickness of 15 μm was used as an adhesive resin layer, and a thickness of 10 μm was used as a heat seal layer. , A mixed resin of cyclic polyolefin (TOPAS8007F-600 manufactured by Polyplastics Co., Ltd.) and 80% by mass of linear low density polyethylene (LLDPE melting point 96° C., density 0.927 g/cm ³ ) (the mixed resin is cyclic polyolefin 20% by mass, blend of 20% by mass of LLDPE) and melt coextrusion lamination, and PET layer/anchor coat agent layer/PE layer/barrier layer/anchor coat agent layer/adhesive resin layer/heat seal layer in this order. A laminated body was obtained. In the laminate, the PET layer had a thickness of 12 μm, the PE layer had a thickness of 15 mm, the aluminum foil had a thickness of 7 μm, the adhesive resin layer had a thickness of 15 μm, and the heat seal layer had a thickness of 10 μm.

The obtained laminate is folded so that the heat-sealing layers face each other, the heat-sealing layers are overlapped with each other, and heat-sealed under the conditions of a heating temperature of 140° C., a pressure of 1 kgf/cm ² , and a sealing time of 1 second, and a packaging bag. Got

[Example 6]
In Example 6, the layered product of Example 5 was used as a first layered product, and the layered product of the layered product of Example 5 excluding the adhesive resin layer was used as a second layered product. It is an example of the package which heat-sealed the laminated body of 1 and the 2nd laminated body.
(First laminated body)
The first laminate has the same layer configuration, thickness, and manufacturing method as the laminate of the fifth embodiment.
(Second laminated body)
A 12 μm-thick biaxially stretched PET film (E-5100 manufactured by Toyobo Co., Ltd.) having one surface corona-treated as a base material layer was set as the primary paper feed of an extrusion laminating machine. The corona-treated surface of this substrate layer was coated with a two-component urethane anchor coating agent (Takelac A3210/Takenate A3075 manufactured by Mitsui Chemicals, Inc.) to a thickness of 0.3 g/m ² (dry state), A heat treatment was performed at 100° C. for 2 seconds to form an anchor coating agent layer.

Next, an aluminum foil (1N30 manufactured by Toyo Aluminum Co., Ltd.) having a thickness of 7 μm was set as a barrier layer in the secondary sheet feeding of the extrusion laminating machine, and was placed between the anchor coating agent layer of the laminated film and the aluminum foil. , T-die, low-density polyethylene (LDPE; Novatec LC600A manufactured by Nippon Polyethylene Co., Ltd.) as an adhesive layer is melt extruded at 330° C. to a thickness of 15 μm, and the anchor coat agent layer and the aluminum foil are adhesively bonded. Sand laminated through the polyethylene layer of the layer. Then, a two-component urethane anchor coating agent (Takelac A3210/Takenate A3075 manufactured by Mitsui Chemicals, Inc.) was applied to the aluminum barrier layer of the laminated film obtained by the above sand lamination to a thickness of 0.3 g/m ² (dry state). And a heat treatment at 90° C. for 2 seconds to form an anchor coating agent layer.

Further, on the surface of the anchor coat agent layer, a low-density polyethylene (LDPE; Novatec LC600A manufactured by Nippon Polyethylene Corporation) having a thickness of 25 μm was melt-extruded as a heat-sealing layer from a T-die at a set temperature of 290° C. to form a PET layer/ An anchor coat agent layer/PE layer/barrier layer/anchor coat agent layer/heat seal layer were laminated in this order to obtain a laminate. In the laminate, the PET layer had a thickness of 12 μm, the PE layer had a thickness of 15 μm, the aluminum barrier layer had a thickness of 7 μm, and the heat seal layer had a thickness of 25 μm.

(Packaging bag)
The heat-sealing layer of the first laminate obtained above and the heat-sealing layer of the second laminate were superposed, and heat-sealed under the conditions of a heating temperature of 140° C., a pressure of 1 kgf/cm ² , and a sealing time of 1 second. Then, a packaging bag was obtained.

[Example 7]
Example 7 is an example in which the heat seal layer is polypropylene.
The laminate of Example 1 and the heat-sealing layer (thickness 10 μm) of the packaging bag were prepared by using 20% by mass of cyclic polyolefin (TOPAS8007F-600 manufactured by Polyplastics Co., Ltd.) and 80% by mass of polypropylene (Prime Polymer Co., Ltd., F329RA). A laminated body and a packaging bag were obtained in the same manner as in Example 1 except that the mixed resin (blend) of 1) was changed.

[Comparative Example 1]
Comparative Example 1 is an example in which the laminate does not have an adhesive resin layer and the heat seal layer does not include a cyclic polyolefin, as compared with Example 1.
A 12 μm-thick biaxially stretched PET film (E-5100 manufactured by Toyobo Co., Ltd.) having one surface corona-treated as a base material layer was set as the primary paper feed of an extrusion laminating machine. The corona-treated surface of this substrate layer was coated with a two-component urethane anchor coating agent (Takelac A3210/Takenate A3075 manufactured by Mitsui Chemicals, Inc.) to a thickness of 0.3 g/m ² (dry state), A heat treatment was performed at 100° C. for 2 seconds to form an anchor coating agent layer.

Next, on the surface of the anchor coat agent layer, a 25 μm-thick low-density polyethylene (LDPE; Novatec LC600A manufactured by Nippon Polyethylene Corporation) was melt-extruded as a heat-sealing layer from a T-die at a set temperature of 290° C. to form a PET layer. Thus, a laminated body was obtained by laminating the following: /anchor coat agent layer/heat seal layer. In the laminate, the PET layer had a thickness of 12 μm and the heat seal layer had a thickness of 25 μm.

The obtained laminate is folded so that the heat-sealing layers face each other, the heat-sealing layers are overlapped with each other, and heat-sealed under the conditions of a heating temperature of 140° C., a pressure of 1 kgf/cm ² , and a sealing time of 1 second, and a packaging bag. Got

[Comparative Example 2]
Comparative Example 2 is an example in which the laminate does not have an adhesive resin layer and the heat seal layer does not include a cyclic polyolefin, as compared with Example 5.
A 12 μm-thick biaxially stretched PET film (E-5100 manufactured by Toyobo Co., Ltd.) having one surface corona-treated as a base material layer was set as the primary paper feed of an extrusion laminating machine. The corona-treated surface of this substrate layer was coated with a two-component urethane anchor coating agent (Takelac A3210/Takenate A3075 manufactured by Mitsui Chemicals, Inc.) to a thickness of 0.3 g/m ² (dry state), A heat treatment was performed at 100° C. for 2 seconds to form an anchor coating agent layer.

Next, an aluminum foil (1N30 manufactured by Toyo Aluminum Co., Ltd.) having a thickness of 7 μm was set as a barrier layer in the secondary sheet feeding of the extrusion laminating machine, and was placed between the anchor coating agent layer of the laminated film and the aluminum foil. , T-die, low density polyethylene (LDPE; Novatec LC600A manufactured by Nippon Polyethylene Co., Ltd.) is melt-extruded at 330° C. to a thickness of 15 μm as an adhesive layer, and the anchor coat agent layer and the aluminum foil are adhesively bonded. Sand laminated through layers of polyethylene. Then, on the surface of the aluminum barrier layer of the laminated film obtained by the above-mentioned sand lamination, a two-pack type urethane anchor coating agent (Takelac A3210/Takenate A3075 manufactured by Mitsui Chemicals, Inc.) was formed to a thickness of 0.3 g/m ² (dry). State) and heat treated at 90° C. for 2 seconds to form an anchor coating agent layer.

On the surface of the anchor coating agent layer, low density polyethylene (LDPE; Novatec LC600A manufactured by Nippon Polyethylene Co., Ltd.) having a thickness of 25 μm is melt-extruded as a heat-sealing layer from a T-die at a set temperature of 290° C. to form a PET layer/anchor coat. A layered product was obtained in which the agent layer/PE layer/barrier layer/anchor coat agent layer/heat seal layer were laminated in this order.

The obtained laminated body was folded so that the heat-sealing layers face each other, the heat-sealing layers were overlapped with each other, and heat-sealed under the conditions of a heating temperature of 140° C., a pressure of 1 kgf/cm ² , and a sealing time of 1 second to form a packaging bag. Obtained.

<Reclose test>
A heat-sealed portion of a packaging bag made of the laminate of Examples 1 to 7 and Comparative Examples 1 and 2 was cut into a strip shape having a width of 15 mm, and in accordance with JIS K 6854, at a pulling rate of 300 mm/min in an atmosphere of 25°C, 1 The opening strength for the second time was measured. Since the packaging bag was separated between the adhesive resin layer and the heat seal layer of the packaging material, the unsealing strength was the interlayer adhesive strength between the adhesive resin layer and the heat seal layer.
After the first opening strength was measured, the heat-sealed portion of the packaging bag was pressed by hand. After crimping, the seal was reopened (first resealing), and the resealing strength at that time was measured under a 25° C. atmosphere at a pulling speed of 300 mm/min to measure the adhesive strength between the adhesive resin layer and the heat seal layer of the packaging material. This work was repeated for the second reopening, the third reopening, and the fourth reopening to obtain the reopening strength for each time.
The results obtained are shown in Table 1.

From Table 1, the packaging bags of Examples 1 to 7 had the performance that was difficult to realize in the past, that is, the packaging bags still had a sufficient reclose property even after being reopened a plurality of times. On the other hand, the packaging bags of Comparative Examples 1 and 2 which did not use the adhesive resin could not be reclosed once opened.
By using the laminate or the packaging material of the present invention, for example, the packaging material for food can be reclosed with sufficient strength even after it has been opened once, so that the food or the like can be stored for a longer period of time. Becomes

<Dead hold test>
The laminates obtained in Examples 1 to 7 and Comparative Examples 1 and 2 were folded in half with the heat seal layer on the outer side and the base material layer on the inner side, and the crease was manually squeezed three times. The folded laminate was left at 25° C. for 30 seconds and visually evaluated whether the folded state was maintained. The case where the laminated body maintained the bent state after standing was evaluated as ◯, and the case where the laminated body was returning to the original state after standing was evaluated as ×, and the test results are shown in Table 2.

It can be seen from Table 2 that Examples 1 to 7 have a dead hold property.

[Example 8]
Example 8 is an example of a container in which the laminated body of Example 1 is used as a lid material and heat-sealed with a separately prepared bottom material. The bottom material has a surface layer made of polyethylene and has a thickness of 250 μm.
(Cover material)
A 12 μm-thick biaxially stretched PET film (E-5100 manufactured by Toyobo Co., Ltd.) having one surface corona-treated was set as the primary paper feed as a base material layer. The corona-treated surface of this substrate layer was coated with a two-component urethane anchor coating agent (Takelac A3210/Takenate A3075 manufactured by Mitsui Chemicals, Inc.) to a thickness of 0.3 g/m ² (dry state), A heat treatment was performed at 100° C. for 2 seconds to form an anchor coating agent layer.

Next, on the surface of the anchor coating agent layer, from a T-die, a styrene block polymer having a thickness of 15 μm (MWW65 made by Bostik SA, density 0.96 g/cm ³ ,) as an adhesive resin layer, and a thickness as a heat seal layer. A mixed resin of 10 μm of cyclic polyolefin (TOPAS8007F-600 manufactured by Polyplastics Co., Ltd.) and linear low-density polyethylene (LLDPE, melting point 96° C., density 0.927 g/cm ² ) (the mixed resin is 20 cyclic polyolefins. Mass% and a blend of 80% by mass of LLDPE) were co-extrusion laminated to obtain a laminate in which the PET layer/anchor coating agent layer/adhesive resin layer/heat seal layer were laminated in this order. In the laminate, the PET layer had a thickness of 12 μm, the adhesive resin layer had a thickness of 15 μm, and the heat seal layer had a thickness of 10 μm.

The heat-sealing layer of the obtained laminate and the polyethylene layer of the bottom material were superposed, and using a semi-automatic tray sealer M (manufactured by Nakamura Sangyo Co., Ltd.), a heating temperature of 140° C., a pressure of 3 kgf/cm ² , Tray sealing was performed under the condition that the sealing time was 0.5 seconds to obtain a container.
The heat-sealed portion of the obtained container was cut into a strip having a width of 15 mm, and the first opening strength was measured in accordance with JIS K 6854 under a 25° C. atmosphere at a pulling rate of 300 mm/min, and it was 12 N/15 mm. It was Since the container was separated between the adhesive resin layer and the heat seal layer of the lid material, the unsealing strength was the interlayer adhesive strength between the adhesive resin layer and the heat seal layer.

After measuring the opening strength for the first time, the heat-sealed portion of the peeled lid member and the peeled bottom member was pressed by hand. After pressure bonding, it was opened again (first reopening), and the reopening strength at that time was measured under a 25° C. atmosphere at a pulling rate of 300 mm/min to measure the adhesive strength between the adhesive resin layer and the heat seal layer of the lid material. This work was repeated for the second reopening, the third reopening, and the fourth reopening to obtain the reopening strength for each time.

As a result, the opening strength was 12 N/15 mm, the first reopening strength was 6.8 N/15 mm, the second reopening strength was 5.8 N/15 mm, and the third reopening strength was 5.2 N/15 mm. The reopening strength for the second time was 4.2 N/15 mm.

Further, the lid member was folded in half with the heat seal layer on the outer side and the base material layer on the inner side, and the crease was manually squeezed three times. When the folded laminated body was left at 25° C. for 30 seconds and visually evaluated whether the folded state was maintained, it was found that the laminated body kept the folded state after being left standing. Therefore, the lid material had a dead hold property.

[Example 9]
Example 9 is an example in which the composition of the heat-sealing layer was changed in addition to Example 8.
A 12 μm-thick biaxially stretched PET film (E-5100 manufactured by Toyobo Co., Ltd.) having one surface corona-treated as a base material layer was set as the primary paper feed of an extrusion laminating machine. The corona-treated surface of this substrate layer was coated with a two-component urethane anchor coating agent (Takelac A3210/Takenate A3075 manufactured by Mitsui Chemicals, Inc.) to a thickness of 0.3 g/m ² (dry state), A heat treatment was performed at 100° C. for 2 seconds to form an anchor coating agent layer.

Next, on the surface of the anchor coat agent layer, a styrene block polymer having a thickness of 15 μm (density 0.96 g/cm ³ , styrene monomer 10% by mass, styrene block copolymer 55% by mass) was used as an adhesive resin layer from a T-die. And 30% by mass of a tackifier, and the balance of 1.2% by mass of an inorganic filler), a cyclic polyolefin (TOPAS8007F-600 manufactured by Polyplastics Co., Ltd.) having a thickness of 10 μm as a heat seal layer, and a linear low density. Polyethylene (LLDPE, melting point 96° C., density 0.927 g/cm ² ) mixed resin (mixed resin is a blend of cyclic polyolefin of 20% by mass and LLDPE of 80% by mass) is coextrusion laminated to form a PET layer/ An anchor coat agent layer/adhesive resin layer/heat seal layer were laminated in this order to obtain a laminate. In the laminate, the PET layer had a thickness of 12 μm, the adhesive resin layer had a thickness of 15 μm, and the heat seal layer had a thickness of 10 μm.

The heat-sealing layer of the obtained laminate and the polyethylene layer of the bottom material were superposed, and using a semi-automatic tray sealer M (manufactured by Nakamura Sangyo Co., Ltd.), a heating temperature of 140° C., a pressure of 3 kgf/cm ² , Tray sealing was performed under the condition that the sealing time was 0.5 seconds to obtain a container.
The heat-sealed portion of the obtained container was cut into a strip having a width of 15 mm, and the first opening strength was measured in accordance with JIS K 6854 under a 25° C. atmosphere at a pulling rate of 300 mm/min. (14 N/15 mm) Met. Since the container was separated between the adhesive resin layer and the heat seal layer of the lid material, the unsealing strength was the interlayer adhesive strength between the adhesive resin layer and the heat seal layer.

After measuring the opening strength for the first time, the heat-sealed portion of the peeled lid member and the peeled bottom member was pressed by hand. After pressure bonding, it was opened again (first reopening), and the reopening strength at that time was measured under a 25° C. atmosphere at a pulling rate of 300 mm/min to measure the adhesive strength between the adhesive resin layer and the heat seal layer of the lid material. This work was repeated for the second reopening, the third reopening, and the fourth reopening to obtain the reopening strength for each time.

As a result, the opening strength was 14 N/15 mm, the first reopening strength was 6.2 N/15 mm, the second reopening strength was 5.1 N/15 mm, and the third reopening strength was 4.2 N/15 mm. The reopening strength for the second time was 3.2 N/15 mm.

Further, the lid member was folded in half with the heat seal layer on the outer side and the base material layer on the inner side, and the crease was manually squeezed three times. When the folded laminated body was left at 25° C. for 30 seconds and visually evaluated whether the folded state was maintained, it was found that the laminated body kept the folded state after being left standing. Therefore, the lid material had a dead hold property.

[Example 10]
Example 10 is an example in which the composition of the heat seal layer was changed.
A 12 μm-thick biaxially stretched PET film (E-5100 manufactured by Toyobo Co., Ltd.) having one surface corona-treated as a base material layer was set as the primary paper feed of an extrusion laminating machine. The corona-treated surface of this substrate layer was coated with a two-component urethane anchor coating agent (Takelac A3210/Takenate A3075 manufactured by Mitsui Chemicals, Inc.) to a thickness of 0.3 g/m ² (dry state), A heat treatment was performed at 100° C. for 2 seconds to form an anchor coating agent layer.

Next, on the surface of the anchor coating agent layer, a styrene block polymer having a thickness of 15 μm (density 0.96 g/cm ³ , styrene monomer 30% by mass, styrene block copolymer 20% by mass) was used as an adhesive resin layer from a T-die. And 45% by mass of a tackifier, and the balance of 1.2% by mass of an inorganic filler), a cyclic polyolefin (TOPAS8007F-600 manufactured by Polyplastics Co., Ltd.) having a thickness of 10 μm as a heat seal layer, and a linear low density. Polyethylene (LLDPE, melting point 96° C., density 0.927 g/cm ² ) mixed resin (mixed resin is a blend of cyclic polyolefin of 20% by mass and LLDPE of 80% by mass) is coextrusion laminated to form a PET layer/ An anchor coat agent layer/adhesive resin layer/heat seal layer were laminated in this order to obtain a laminate. In the laminate, the PET layer had a thickness of 12 μm, the adhesive resin layer had a thickness of 15 μm, and the heat seal layer had a thickness of 10 μm.

The heat-sealing layer of the obtained laminate and the polyethylene layer of the bottom material were superposed, and using a semi-automatic tray sealer M (manufactured by Nakamura Sangyo Co., Ltd.), a heating temperature of 140° C., a pressure of 3 kgf/cm ² , Tray sealing was performed under the condition that the sealing time was 0.5 seconds to obtain a container.
The heat-sealed portion of the obtained container was cut into a strip having a width of 15 mm, and the first opening strength was measured in accordance with JIS K 6854 under a 25° C. atmosphere at a pulling rate of 300 mm/min. (15 N/15 mm) Met. Since the container was separated between the adhesive resin layer and the heat seal layer of the lid material, the unsealing strength was the interlayer adhesive strength between the adhesive resin layer and the heat seal layer.

After measuring the opening strength for the first time, the heat-sealed portion of the peeled lid member and the peeled bottom member was pressed by hand. After pressure bonding, it was opened again (first reopening), and the reopening strength at that time was measured under a 25° C. atmosphere at a pulling rate of 300 mm/min to measure the adhesive strength between the adhesive resin layer and the heat seal layer of the lid material. This work was repeated for the second reopening, the third reopening, and the fourth reopening to obtain the reopening strength for each time.

As a result, the unsealing strength was 15 N/15 mm, the first resealing strength was 7.8 N/15 mm, the second resealing strength was 6.6 N/15 mm, and the third resealing strength was 5.3 N/15 mm. The reopening strength for the second time was 4.2 N/15 mm.

Further, the lid member was folded in half with the heat seal layer on the outer side and the base material layer on the inner side, and the crease was manually squeezed three times. When the folded laminated body was left at 25° C. for 30 seconds and visually evaluated whether the folded state was maintained, it was found that the laminated body kept the folded state after being left standing. Therefore, the lid material had a dead hold property.

The sealant film, the laminate, the lid, the container, the packaging material, and the packaging bag of the present invention have been specifically described using the embodiments and examples, but the sealant film, the laminate, the lid material, and the present invention of the present invention have been described. The container, the packaging material, and the packaging bag are not limited to the description of these embodiments and examples, and various modifications can be made without departing from the spirit of the present invention.

1 Sealant Film 2 Adhesive Resin Layer 3 Heat Seal Layer 11 Laminated Body 21 Container 22 Lid 23 Bottom Material 31 Packaging Material 32 Packaging Material 41 Packaging Bag 42 Packaging Bag

Claims (11)

At least an adhesive resin layer, and a heat seal layer, a sealant film having a laminate,
The adhesive resin layer is a resin layer containing a styrene monomer, a styrene block copolymer and a tackifier,
A sealant film having resealing and dead-holding properties, wherein the heat-sealing layer is a resin layer containing a cyclic polyolefin. The resealing according to claim 1, wherein the adhesive resin layer is a resin layer containing 10 to 35% by mass of a styrene monomer, 30 to 60% by mass of a styrene block copolymer, and 5 to 60% by mass of a tackifier. Sealant film with good and dead hold properties. The resealing property according to claim 1 or 2, wherein the styrene block copolymer is a block copolymer of styrene and another comonomer, and the other comonomer is one selected from isoprene, butadiene, and butylene. And a sealant film having a dead hold property. The tackifier is one or more selected from rosin, hydrogenated rosin, rosin derivative, hydrogenated rosin derivative, rosin ester, polyterpene, phenol terpene and phenol terpene derivative. A sealant film having resealing property and dead hold property according to the item 1. The sealant film having resealing property and dead hold property according to claim 1, wherein the adhesive resin layer further contains an inorganic filler. The heat-sealing layer is an olefin-based resin, and the olefin-based resin contains the cyclic polyolefin in an amount of 10 to 50 mass%. The sealant film having re-sealing property and dead hold property according to claim 1. .. A base material layer is superposed on the adhesive resin layer side of the sealant film having resealing property and dead hold property according to any one of claims 1 to 6 via an adhesive layer. A laminated body. A lid member comprising the laminate according to claim 7. A container comprising: the lid member according to claim 8; and a bottom member to be heat-sealed with the lid member, wherein a surface layer of the bottom member has a heat seal layer of the same kind as the heat seal layer of the lid member. .. A packaging material comprising the laminate according to claim 7. A packaging bag comprising the packaging material according to claim 10.

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